Reverse Pulse Baghouses
Reverse Pulse Baghouses for Hot Mix Asphalt Facilities
With ever increasing specifications, dust handling has become a critical component in all asphalt plant operations. With that in mind, Astec offers the Reverse Pulse™ baghouse. Modular in design, the Reverse Pulse baghouse can be fitted to your exact size requirements. The Reverse Pulse baghouse is available in a range of sizes from 5,000 to over 100,000 ACFM. It is a ruggedly constructed system; manufactured out of 3/16” corrosion resistant steel plating.
Features & Benefits
- Modular design can be fitted to exact size requirements
- A range of sizes are available for 5,000 to over 100,000 ACFM
- Portable and Stationary Configurations
- Collect coarse fines and small fines separately to minimize wear
- 14 oz. Aramid bags capture particles
The low profile portable Reverse Pulse baghouse is built on a heavy-duty tri-axle frame with operating components already pre-mounted for easy placement. This single load system is easy to operate and easy to maintain.
Stationary facilities provide a high degree of flexibility for customized layouts and special features. The stationary Reverse Pulse baghouse features massive, weight distributing, pyramid style supports that provide a solid foundation for the entire baghouse system.
Reverse Pulse Baghouse
A Reverse Pulse baghouse includes a primary dust system to collect the coarse fines. These fines are then available to be returned to the mix, stored or wasted as needed. Collecting the coarse and small fines separately minimizes wear to components.
Primary Dust System
Reverse Pulse baghouses feature either a primary collector or an inertial separator (shown opposite page) for removing large fines from the airstream before it enters the baghouse. Generally, these particles are larger than 200 mesh, while fines from the baghouse consist of particles smaller than 200 mesh. The coarse fines can be easily returned to the mix.
Since very few large fines enter the baghouse, it can collect small fines more efficiently. Removal of coarser fines also eliminates much of the wear from these particles so filter bags and other components last much longer.
Handle Dust Easily, Efficiently
A reinforced, large capacity hopper section with powerful auger and drive system promotes quick and easy dust handling, whether you want to store, reintroduce or waste the dust.
Reverse Pulse Baghouse
QUICK AND FLEXIBLE
The Reverse Pulse baghouse offers stationary units for design and performance flexiblility and portable units for quick set up and mobility. The design of the baghouse collects coarse fines and small fines separately to minimize wear of baghouse components.
Pulse Air Operation
The patented Reverse Pulse process utilizes a rotating nozzle assembly with timed indexing and fast acting air doors. The air doors keep outside air intake to a minimum, maintaining efficiency of the baghouse while the rotating nozzle system ensures sequential isolation and cleaning of each row of bags. After aligning the nozzle to isolate a single row of bags, the air door quickly opens, providing a pulse of air dislodging the dust from the bags. The air door is closed, and the row is kept off line, allowing the dislodged dust to fall away from the bags. As the nozzle indexes to the next row, the cleaned bags are gradually brought on line, reducing bag fatigue. A dedicated air compressor is not required as the exhaust fan provides the air for cleaning. Individually adjustable time delays on the air door and nozzle indexing allows the operator to adjust cleaning times to maintain optimal efficiency.
Direct Drive Stepper Motor
The Reverse Pulse baghouse turret utilizes a direct drive servo stepper motor. The direct drive motor has fewer parts for more reliability and easier maintenance.
Reverse Pulse Baghouse
- Gas stream exits the drum mixer or dryer through duct work and passes through the inertial separator.
- The air stream flows through the inertial separator which removes coarse particles.
- Air flow moves through baffle plates knocking down any “heavy dust” that can prematurely wear bags and cages.
- Rotating indexing systems prevents “puffing” and dust release to the stack. The unique rotating nozzle assembly ensures sequential isolation and cleaning of each row of bags.
- Dirty air travels through the row of 14oz. Aramid bags, capturing the particles.
- Reverse pulse air causes the bags to expand and expel the collected dust cake from the surface of the bag. The dust is thoroughly flushed into the collection hopper.
- Dust settles in the bottom of the hopper and then is removed by one or more screw augers to be stored, reintroduced or wasted.
- Powerful auger and drive system promotes quick and easy waste removal.
- Precision-balanced, backward-curved dual-drive fan assemblies offer a wide range of operating conditions with higher efficiencies than other fan designs. Airflow is controlled by vane dampers or variable speed drives (optional).
- Clean air exits exhaust stack.